Numerical simulation of relativistic Backward-wave tubes

In this paper, a Ku band relativistic backwave oscillator based on annular strong current explosion emission is proposed. The modulation of ring relativistic electron beam is realized by adjusting the distance between anode and cathode of diode, adding reflection cavity in front of slow wave structure, adding drift section between two slow wave structure, adjusting the size of slow wave structure and so on. The numerical simulation results show that the Ku band microwave output power is 1.38 Gw, the frequency is about 12.5 Ghz, and the efficiency is about 40% under the conditions of 532 kV, 3150 A and 0.6 T.